Method and apparatus for transmitting and receiving control channel and data channel for NR system

ABSTRACT

Provided is a scheduling information transmission/reception method and apparatus for an NR system in a wireless communication system. A method for receiving, by a terminal, scheduling information for data transmission or reception in a wireless communication system according to one aspect of the present invention may comprise the steps of: receiving, from a base station, information indicating a first physical resource supporting a first subcarrier spacing within a time interval and a second physical resource supporting a second subcarrier spacing within the time interval; receiving at least one of first scheduling information for the first physical resource and second scheduling information for the second physical resource; and performing the data transmission or reception on the basis of the at least one of the first scheduling information and the second scheduling information.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage Entry of PCT InternationalApplication No. PCT/KR2017/005523, which was filed on May 26, 2017, andwhich claims priority from and the benefit of Korean Patent ApplicationNos. 10-2017-0065238, filed on May 26, 2017, 10-2017-0064371, filed onMay 24, 2017, and 10-2016-0065166, filed on May 27, 2016, in the KoreanIntellectual Property Office, the disclosures of which are herebyincorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to a wireless communication system, andmore particularly, to a method, apparatus, software for transmission andreception of a control channel and a data channel for a new radio (NR)system, or a storage medium storing software.

RELATED ART

The IMT (International Mobile Telecommunication) frameworks andstandards have been developed by ITU (International TelecommunicationUnion) and, recently, the 5th generation (5G) communication has beendiscussed through a program called “IMT for 2020 and beyond”.

In order to satisfy requirements from “IMT for 2020 and beyond”, thediscussion is in progress about a way for enabling the 3rd GenerationPartnership Project (3GPP) New Radio (NR) system to support variousnumerologies by taking into consideration various scenarios, variousservice requirements, potential system compatibility. Also, to meet suchvarious scenarios and various requirements in a single NR system, it isconceivable to support a scalable numerology. However, no detailedmethod for supporting the scalable numerology in the NR system has beendefined yet.

DETAILED DESCRIPTION Technical Object

An aspect of the present disclosure provides a method and apparatus fortransmission and reception of a control channel and a data channel in anew wireless communication system supporting a scalable numerology.

The above description is to explain the technical aspects of exemplaryembodiments of the present invention, and it will be apparent to thoseskills in the art that modifications and variations can be made withoutdeparting from the spirit and scope of the present invention.

Technical Solution

According to an aspect of the present disclosure, there is provided amethod of receiving, by a terminal, scheduling information for datatransmission or reception in a wireless communication system, the methodincluding receiving, from a base station, information indicating a firstphysical resource that supports a first subcarrier spacing within a timeinterval and a second physical resource that supports a secondsubcarrier spacing within the time interval; receiving at least one offirst scheduling information for the first physical resource and secondscheduling information for the second physical resource; and performingthe data transmission or reception based on at least one of the firstscheduling information and the second scheduling information.

The features of the present disclosure briefly summarized as above areprovided as only aspects of the detailed description of the presentdisclosure and are not provided to limit the scope of the presentdisclosure.

Effect

According to the present disclosure, there may be provided a method andapparatus for transmission and reception of a control channel and a datachannel in a new wireless communication system supporting a scalablenumerology.

The above description is to explain the technical aspects of exemplaryembodiments of the present invention, and it will be apparent to thoseskills in the art that modifications and variations can be made withoutdeparting from the spirit and scope of the present invention. Thus, itis intended that the present invention cover the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

BRIEF DESCRIPTION OF DRAWINGS

Various examples will be described more fully hereinafter with referenceto the accompanying drawings. Throughout the drawings and the detaileddescription, unless otherwise described, the same drawing referencenumerals are understood to refer to the same elements, features, andstructures. In describing the examples, detailed description on knownconfigurations or functions may be omitted for clarity and conciseness.

FIG. 1 illustrates examples of a downlink transmit time interval (TTI)according to the present disclosure.

FIG. 2 illustrates examples of an uplink TTI according to the presentdisclosure.

FIGS. 3 and 4 illustrate examples of mixed-TTI scheduling using a longerdownlink control information (DCI) format for a single new radio (NR)terminal according to the present disclosure.

FIG. 5 illustrates another example of mixed-TTI scheduling using alonger DCI format for a single NR terminal according to the presentdisclosure.

FIG. 6 illustrates another example of mixed-TTI scheduling using alonger DCI format for a single NR terminal according to the presentdisclosure.

FIG. 7 illustrates an example of 2-stage DCI scheduling using amulti-TTI according to the present disclosure.

FIG. 8 illustrates an example of overriding resource assignment oflonger DCI based on shorter DCI according to the present disclosure.

FIG. 9 illustrates an example of DCI based TTI switching according tothe present disclosure.

FIG. 10 illustrates an example of preset or common signaling based TTIswitching according to the present disclosure.

FIG. 11 illustrates an example of a method for transmission andreception of a control channel and a data channel based on a pluralityof numerologies in an NR system according to the present disclosure.

FIG. 12 is a diagram illustrating a configuration of a wireless deviceaccording to the present disclosure.

BEST MODE

Various examples will be described more fully hereinafter with referenceto the accompanying drawings. Throughout the drawings and the detaileddescription, unless otherwise described, the same drawing referencenumerals are understood to refer to the same elements, features, andstructures. In describing the examples, detailed description on knownconfigurations or functions may be omitted for clarity and conciseness.

Further, the terms, such as first, second, A, B, (a), (b), and the likemay be used herein to describe elements in the description herein. Theterms are used to distinguish one element from another element. Thus,the terms do not limit the element, an arrangement order, a sequence orthe like. It will be understood that when an element is referred to asbeing “on”, “connected to” or “coupled to” another element, it can bedirectly on, connected or coupled to the other element or interveningelements may be present. In contrast, when an element is referred to asbeing “directly on,” “directly connected to” or “directly coupled to”another element, there are no intervening elements present.

In the described exemplary system, although methods are described basedon a flowchart as a series of steps or blocks, aspects of the presentinvention are not limited to the sequence of the steps and a step may beexecuted in a different order or may be executed in parallel withanother step. In addition, it is apparent to those skilled in the artthat the steps in the flowchart are not exclusive, and another step maybe included or one or more steps of the flowchart may be omitted withoutaffecting the scope of the present invention. When an embodiment isembodied as software, the described scheme may be embodied as a module(process, function, or the like) that executes the described function.The module may be stored in a memory and may be executed by a processor.The memory may be disposed inside or outside the processor and may beconnected to the processor through various well-known means.

Further, the description described herein is related to a wirelesscommunication network, and an operation performed in a wirelesscommunication network may be performed in a process of controlling anetwork and transmitting data by a system that controls a wirelessnetwork, e.g., a base station, or may be performed in a user equipmentconnected to the wireless communication network.

It is apparent that various operations performed for communication witha terminal in a network including a base station and a plurality ofnetwork nodes may be performed by the base station or by other networknodes in addition to the base station. Here, the term ‘base station(BS)’ may be interchangeably used with other terms, for example, a fixedstation, a Node B, eNodeB (eNB), gNodeB (gNB), and an access point (AP).Also, the term ‘terminal’ may be interchangeably used with other terms,for example, user equipment (UE), a mobile station (MS), a mobilesubscriber station (MSS), a subscriber station (SS), and a non-APstation (non-AP STA).

Herein, transmitting or receiving a channel includes a meaning oftransmitting or receiving information or a signal through thecorresponding channel. For example, transmitting a control channelindicates transmitting control information or a signal through thecontrol channel. Likewise, transmitting a data channel indicatestransmitting data information or a signal through the data channel.

Hereinafter, examples of the present disclosure will be described, whichrelate to a frame structure supporting a control channel and a datachannel, a method of assigning the control channel and the data channel,and a data channel scheduling method in a system (e.g., an NR system)supporting time domain areas within a single frequency domain area. Forexample, a single frequency domain area may correspond to a singlecomponent carrier (CC) and may correspond to a single cell. For example,time domain areas of different numerologies may correspond topredetermined time intervals (e.g., definable as subframes or transmittime intervals (TTIs)) each having a different length. Hereinafter,various examples of the present disclosure will be described regarding amethod of assigning, by a base station, a transmission resource for acontrol channel and a data channel to a terminal or a method ofmonitoring, by the terminal, and receiving the control channel and thedata channel in the system supporting time domain areas of differentnumerologies within a single frequency domain area.

In the following description, a system to which various examples of thepresent disclosure are applied may be referred to as a New Radio (NR)system to be distinguished from other existing systems. However, thescope of the present disclosure is not limited thereto or restrictedthereby. In addition, although the term ‘NR system’ is used herein as anexample of a wireless communication system capable of supporting avariety of subcarrier spacings (SCSs), the term ‘NR system’ is notlimited to the wireless communication system for supporting a pluralityof subcarrier spacings.

Initially, a numerology used in the NR system is described.

An NR numerology may indicate a numerical value of a basic element orfactor that generates a resource grid on a time-frequency domain fordesign of the NR system. As an example of a numerology of a 3rdGeneration Partnership Project (3GPP) Long Term Evolution(LTE)/LTE-Advanced (LTE-A) system, a subcarrier spacing corresponds to15 kilohertz (kHz) (or 7.5 kHz in the case of Multicast-BroadcastSingle-Frequency Network (MBSFN)) and a normal Cyclic Prefix (CP) or anextended CP. Here, the meaning of the term ‘numerology’ does notrestrictively indicate only the subcarrier spacing and includes a CyclicPrefix (CP) length, a Transmit Time Interval (TTI) length, a number ofOrthogonal Frequency Division Multiplexing (OFDM) symbols within adesired time interval, a duration of a single OFDM symbol, etc.,associated with the subcarrier spacing (or determined based on thesubcarrier spacing). That is, one numerology may be distinguished fromanother numerology based on at least one of the subcarrier spacing, theCP length, the TTI length, the number of OFDM symbols within the desiredtime interval, and the duration of the single OFDM symbol.

To meet the requirements of the program “International MobileTelecommunication (IMT) for 2020 and beyond”, the 3GPP NR system iscurrently considering a plurality of numerologies based on variousscenarios, various service requirements, compatibility with a potentialnew system, and the like. In more detail, since current numerologies ofwireless communication systems may not readily support, for example, afurther higher frequency band, faster movement rate, and lower latencyrequired in the program “IMT for 2020 and beyond”, there is a need todefine a new numerology.

For example, the NR system may support applications, such as enhancedMobile Broadband (eMBB), massive Machine Type Communications/UltraMachine Type Communications (mMTC/uMTC), and Ultra-Reliable and LowLatency Communications (URLLC). In particular, the requirements for userplane latency on the URLLC or eMBB service correspond to 0.5 ms in anupper link and 4 ms in all of the upper link and a down link. Asignificant latency decrease is required compared to the latency of 10ms required in the 3GPP LTE and LTE-A system.

To meet such various scenarios and various requirements in a single NRsystem, there is a need to support a flexible or scalable numerology(hereinafter, a scalable numerology). To support a numerology of the NRsystem having scalability, values shown in Table 1 may be used.

TABLE 1 Motivation Scenarios Subcarrier spacing CP length TTI lengthDiverse eMBB >=15 kHz Depend on scenarios Depend on scenarios serviceBroadcast MBSFN <=15 kHz Longer CP Longer TTI transmission mMTC <=15 kHzLonger CP Longer TTI URLLC FFS Depend on scenarios Shorter TTI DiverseLow to medium UE speed  15 kHz Depend on services Depend on servicesdeployment High UE speed >=60 kHz Depend on services Depend on servicesFading channel — Depend on channel — Multiple sites transmission —Longer CP — Diverse Sub-6 GHz Depend on scenarios Depend on scenariosDepend on scenarios spectrum Above 6 GHz Larger carrier Shorter CPShorter TTI spacing Other services Future scenarios TBD, should ensureTBD, should ensure TBD, should ensure and deployments forwardcompatibility forward compatibility forward compatibility

Referring to Table 1, the scalable numerology for the NR system may beapplied to a subcarrier spacing, a cyclic prefix (CP) length, and a TTIlength. However, it is provided as an example only and the scalablenumerology may be applied to other targets.

Hereinafter, a method of deriving a plurality of scalable numerologyvalues will be described.

Initially, there is a need to support more than one subcarrier spacingfor the NR system. To this end, a specific subcarrier spacing value thatis a base for deriving other subcarrier spacing value(s) may be defined,which is referred to as a base subcarrier spacing or a fundamentalsubcarrier spacing, and may be represented as Δf0. A set of thefundamental subcarrier spacing and other subcarrier spacings derivedbased thereon may be referred to as a single subcarrier spacing family.Here, a value of the fundamental subcarrier spacing Δf0 may be definedas, for example, a value corresponding to an integer multiple of 15 kHzor a value corresponding to an integer multiple of 17.5 kHz.

Also, the following two options may be considered as the numerology forthe NR system. Option 1 may be an LTE-based numerology and option 2 maybe a numerology of 2N symbols per millisecond (ms).

According to option 1, a number of orthogonal frequency divisionmultiplexing (OFDM) symbols per ms may be 14*2^(k) (k=integer) andΔf0=15 kHz. For example, 7, 14, 28, . . . , etc., may be supported asthe number of OFDM symbols per ms.

According to option 2, the number of OFDM symbols per ms may be 16*2^(k)(k=integer) and Δf0=17.5 kHz. For example, 8, 16, 32, . . . , etc., maybe supported as the number of OFDM symbols per ms. In this case, thesubcarrier spacing family (fsc) may be determined as a set of resultvalues of exponentiation of 2 of the fundamental subcarrier spacing.That is, fsc=Δf0*2^(m) (m=integer). For example, if Δf0=15 kHz, fsc={15,30, 60, . . . }. Alternatively, if Δf0=17.5 kHz, fsc={17.5, 35, 70, . .. }.

Alternatively, fsc may be determined as a set of result values ofinteger multiples of the fundamental subcarrier spacing. That is,fsc=Δf0*M (M=positive integer). For example, if Δf0=15 kHz and M=5,fsc={15, 75, 375, . . . }.

As described above, the range of values of the subcarrier spacing familymay vary depending on a subcarrier spacing driving method. Anappropriate subcarrier spacing deriving method may be applied based on afrequency position (e.g., 6 GHz or more) at which the NR systemoperates, a channel characteristic (e.g., doppler delay, delay spread),a characteristic and requirements of an application to be applied, andthe like.

Hereinafter, various numerologies with respect to a time interval forthe NR system will be described.

For describing the time interval, terms “TTI” and “NR subframe” aredefined.

The TTI refers to a time unit that is generated using one of varioustime scaling schemes. For example, the TTI may correspond to a singlebasic time unit that includes transmission of a control channel, a datachannel, and a reference signal (RS). Here, the various time scalingschemes refer to various schemes for deriving different time lengths ina time domain by applying combinations of different NR numerologies(e.g., different subcarrier spacings, different OFDM symbol durations,different CP lengths, and different numbers of OFDM symbols). That is,the TTI may be configured using various numbers of OFDM symbols andvarious OFDM symbol lengths. The TTI may also be referred to as a term,such as a scheduling frame, to emphasize a functional meaning of theTTI.

The NR subframe refers to a time unit that is configured using a singleTTI or a plurality of TTIs. For example, the NR subframe may correspondto a time unit that includes transmission of ACK/NACK feedbackinformation associated with data information and control information aswell as transmission of a control channel and a data channel. That is,the NR subframe may correspond to a superset of the time unit.

Alternatively, the NR subframe may refer to a predetermined timeinterval that is used as the same time reference by all the terminals(including terminals based on a different numerology) within a cell.That is, the NR subframe may be used in the NR system as a timereference having the absolutely same time interval (e.g., 1 ms)regardless of numerologies. For example, a time interval fortransmitting common control information, a synchronization signal, andsystem information to all the terminals within a cell may be defined asthe NR subframe. For example, the synchronization signal may betransmitted in subframe index numbers 0 and 5, and the systeminformation may be transmitted and received based on a single subframe.Additionally, unicast data transmitted from the base station to eachterminal, an RS, and control information (e.g., downlink controlinformation (DCI), uplink control information (UCI)) may be transmittedbased on not a subframe but in a time interval (e.g., slot). Asdescribed above, a time interval corresponding to a plurality ofsubframes, a time interval corresponding to a single subframe, or a timeinterval shorter than a subframe (e.g., corresponding to a slot) may bedefined as the NR subframe.

As an example of various numerologies with respect to the time intervalfor the NR system, a length of a scalable time interval may be definedby applying a given subcarrier spacing (e.g., fixably applying a singlesubcarrier spacing, such as 15 kHz or 17.5 kHz), maintaining the sameOFDM symbol duration, and assuming different numbers of OFDM symbols.Alternatively, a length of a single time interval may be defined using adifferent subcarrier spacing to adjust a time interval or usingcombination of a subcarrier spacing, the number of OFDM symbols, a CPlength, and the like.

For example, when a fundamental subcarrier spacing of 15 kHz is applied,a TTI with a length of 1 ms and including 14 symbols, a scaled TTI(sTTI) with a length of 0.5 ms and including 7 symbols, and an sTTI witha length of 0.143 ms and including 2 symbols may be defined.

Alternatively, when a fundamental subcarrier spacing of 17.5 kHz isapplied, a TTI with a length of 1 ms and including 16 symbols, an sTTIwith a length of 0.5 ms and including 8 symbols, an sTTIi with a lengthof 0.25 ms and including 4 symbols, and an sTTI with a length of 0.125ms and including 2 symbols may be defined.

Alternatively, regardless of a given CP length and subcarrier spacing, asingle time interval (e.g., TTI or subframe) may include the same numberof OFDM symbols. For example, with respect to both a case in which a 15kHz subcarrier spacing is applied and a case in which a 30 kHzsubcarrier spacing is applied with assuming overhead of a normal CP, asingle time interval (e.g., TTI or subframe) may be configured using thesame number of OFDM symbols. Here, when it is assumed that a single timeinterval is configured using the same 14 symbols with respect to bothcases, the time interval may be configured to have a length of 1 ms withrespect to the case in which the 15 kHz subcarrier spacing is appliedand to have a length of 0.5 ms with respect to the case in which the 30kHz subcarrier spacing is applied.

A plurality of time intervals may be defined using a plurality ofsubcarrier spacings. Description related thereto will be made withreference to FIGS. 1 and 2.

FIG. 1 illustrates examples of a downlink TTI according to the presentdisclosure. FIG. 2 illustrates examples of an uplink TTI according tothe present disclosure.

As shown in examples (a), (b), and (c) of FIG. 1, time intervals (e.g.,TTIs) having different time lengths may be defined in a downlink (DL)and each TTI type may be used for transmission and reception of acontrol channel or a data channel.

The example (a) of FIG. 1 corresponds to DL TTI type 0, may be used fora DL common burst only, and may include 1 or 2 symbols.

The example (b) of FIG. 1 corresponds to DL TTI type 1, may be used fora DL common burst and a DL regular burst, and may include a partial TTI.The DL common burst may correspond to a symbol in front of the DLregular burst based on temporal order.

The example (c) of FIG. 1 corresponds to DL TTI type 2, may be used fora DL common burst and a DL regular burst, and may include a full TTI.The DL common burst may correspond to a symbol in front of the DLregular burst based on temporal order.

As shown in examples (a), (b), and (c) of FIG. 2, time intervals (e.g.,TTIs) having different time lengths may be defined in an uplink (UL) andeach TTI type may be used for transmission and reception of a controlchannel or a data channel.

The example (a) of FIG. 2 corresponds to UL TTI type 0, may be used fora UL common burst, and may include 1 or 2 symbols.

The example (b) of FIG. 2 corresponds to UL TTI type 1, may be used fora UL common burst and a UL regular burst, and may include a partial TTI.The UL common burst may correspond to a symbol behind the UL regularburst based on temporal order.

The example (c) of FIG. 2 corresponds to UL TTI type 2, may be used fora UL common burst and a UL regular burst, and may include a full TTI.The UL common burst may correspond to a symbol behind the UL regularburst based on temporal order.

As described above, a single time interval (e.g., subframe) may beconfigured using one or a plurality of DL TTIs or UL TTIs and a guardinterval (e.g., switching time between DL and UL). For example, eitherDL TTI(s) or UL TTI(s) may be present in a single subframe.Alternatively, all of the DL TTI(s), the UL TTI(s), and the guardinterval may be present in the single subframe.

From DL perspective, resource assignment and scheduling information(e.g., DL grant) for indicating data transmission (e.g., unicast datatransmission) to be transmitted to each terminal, data transmissionaccording thereto, and UCI (e.g., Hybrid Automatic RetransmissionreQuest (HARQ)-ACK) transmission of a terminal corresponding to the datatransmission may be performed within a single time interval. In thiscase, a timing between a DL grant transmission and a DL datatransmission, a UCI transmission timing between DL data and a terminalcorresponding thereto, or a timing between transmission of informationrequesting channel state information (CSI) report/sounding RS (SRS)within the DL grant and transmission of a response (e.g., CSI or SRS) ofa terminal corresponding thereto may be semi-statically set using radioresource control (RRC) signaling or dynamically indicated using DCI to acorresponding terminal by the base station. Herein, a TTI index valuemay be used to indicate a timing. For example, if the DL grant isreceived in TTI index 0 and a timing for DL data transmission isindicated as TTI index 4 by the base station, a corresponding terminalmay expect data reception in the corresponding TTI index 4. Thisoperation may be performed based on a TTI index within a singlesubframe. If the above transmission and reception timing between thebase station and the terminal is indicated and set based on a pluralityof subframes, a timing related operation may be defined based on an TTIindex within the plurality of subframes.

From UL perspective, all of resource assignment and scheduling (e.g., ULgrant) by the base station, transmission and UL data transmission of aterminal corresponding thereto, and a feedback transmission by the basestation may be performed within a single time interval (e.g., subframe).Likewise, a timing between a UL grant transmission and a UL transmissionof a terminal corresponding thereto, or a timing between a ULtransmission of the terminal and transmission of a response (e.g.,HARQ-ACK) of the base station corresponding thereto may besemi-statically set or dynamically indicated using DCI by the basestation, which is similar to the DL.

Basically, a plurality of sTTIs may be defined based on a single NRsubcarrier spacing. In this case, each of the plurality of sTTIs mayhave a different number of OFDM symbols or CP length. Alternatively, theplurality of sTTIs may be defined based on the plurality of NRsubcarrier spacings. In this case, the plurality of sTTIs may have thesame number of OFDM symbols or CP length, and may also have differentnumber of OFDM symbols or CP lengths.

The aforementioned NR numerology requires supporting more than onesubcarrier spacing and may use a method of applying an integer multipleto a fundamental subcarrier spacing value using a scheme of derivingsubcarrier spacing values. Detailed examples associated therewith mayconsider i) subcarrier spacing values including a 15 kHz subcarrierspacing, ii) subcarrier spacing values applying a uniform symbolduration including a CP length and including a 17.5 kHz subcarrierspacing, iii) subcarrier spacing values applying a uniform symbolduration including a CP length and including a 17.06 kHz subcarrierspacing, and iv) subcarrier spacing values including a 21.33 kHzsubcarrier spacing. They are provided as examples only and are not toexclude other examples. In the above examples, it is defined that all ofthe subcarrier spacing values are derived from a specific fundamentalsubcarrier spacing value (i.e., Δf0). Here, a scaling scheme of applying14 ununiform symbols per TTI (or ms) may be applied for above i), and ascheme of applying 2^(m) uniform symbols per TTI (or ms) may be appliedfor above ii), iii), and iv).

Also, if an ununiform symbol duration (including a CP) is supported inthe NR system, there is a need to align a scaled symbol boundary. Forexample, if Δf1=2*Δf0, a boundary of every 2 symbols according to Δf1numerology may be defined to be aligned with a single symbol boundaryaccording to Δf0 numerology. Alternatively, a scaled symbol boundary maybe allowed not to be aligned. Alternatively, although the scaled symbolboundary is not aligned, a subframe boundary may be defined to bealigned.

Also, a plurality of OFDM numerologies applicable to the same frequencydomain may be defined. For example, a plurality of numerologies may beapplied to the same carrier (or component carrier). In this case, amethod of multiplexing the plurality of numerologies needs to bedefined.

Also, a boundary between TTIs according to different numerologies may bedefined. For example, to align a boundary between a TTI (or subframe)and an sTTI (or short subframe), i) if a TTI with a length of 0.5 msincludes 8 symbols based on Δf0, a TTI with a length of 0.25 ms maymaintain the same Δf0 and may include a scaled number of symbols (i.e.,4 symbols), and ii) if the TTI with the length of 0.5 ms includes 8symbols based on Δf0, the TTI with the length of 0.25 ms may maintainthe number of symbols (i.e., 8 symbols) based on Δf1 scaled from Δf0.Also, iii) if the TTI with the length of 0.5 ms includes 7 symbols basedon Δf0 (e.g., 15 kHz), the TTI with the length of 0.25 ms may maintainthe number of symbols (i.e., 7 symbols) based on Δf1 (e.g., 30 kHz)scaled from Δf0. Here, a CP length of a first OFDM symbol is greaterthan other CP lengths by 15 Ts (15 samples, Ts=1/2048*Δf) based on atime of 0.5 ms, among subcarrier spacings of 15 kHz or more. In thismanner, a boundary between TTIs (=slots) based on different numerologiesmay match. Even in this case, matching or not matching a TTI boundaryaccording to the above scheme i) and a TTI boundary according to theabove scheme ii) may be allowed within the same carrier in whichdifferent numerologies are present.

Also, according to the NR scalable numerology, a subcarrier spacing anda CP length may be scaled together to cope with spread of a further longdelay. To this end, at least one extended CP may be additionally appliedin addition to a normal CP and an extended CP defined in a 3GPPLTE/LTE-A system.

According to the aforementioned NR numerology scheme, an NR numerologyto be selected and applied may be determined by a network (e.g., basestation). Also, a configuration based on a different numerology valuemay be provided to each terminal. Also, configurations based on aplurality of numerology values may be provided to a single terminal.

Herein, proposed are a frame structure for supporting a control channeland a data channel and a method of assigning the control channel and thedata channel based on the assumption that various numerologies aredefined in the NR system. That is, the examples disclosed herein maysimply presume that various numerologies are applied and are not limitedto or restricted by a specific value of such a numerology. Also, theframe structure for supporting the control channel and the data channeland the method of assigning the control channel and the data channelaccording to the examples of the present disclosure will be describedbased on numerology family candidates for the NR system. However, thescope of the present disclosure is not limited to or restricted by aspecific value of such a numerology.

In the following description, the control channel in the NR system isreferred to as a New Radio Control Channel (NRCCH) and the data channelis referred to as a New Radio Shared Channel (NRSCH). Controlinformation provided from the base station to a terminal through theNRCCH may be referred to as Downlink Control Information (DCI). Forexample, the DCI may include scheduling information or resourceassignment information for transmission of the NRSCH.

Also, a reference signal used for demodulation of the NRCCH and/or NRSCHis referred to as a New Radio Reference Signal (NRRS).

Also, a prefix “s” used herein indicates a scaled form of a numerologythat is derived based on a fundamental subcarrier spacing (MO) or ascaled form based on a number of symbols with respect to a numerologybased on a subcarrier spacing family (fsc) that is derived based on thefundamental subcarrier spacing (MO). For example, sNRCCH may indicate ascaled control channel according to a numerology (e.g., Δf1) that isderived based on the fundamental subcarrier spacing (MO).

Also, control information may include UE-specific control informationand common control information.

Also, data may include UE-specific data (e.g., unicast NRSCH similar toa Physical Downlink Shared Channel (PDSCH) or a Physical Uplink SharedChannel (PUSCH) in 3GPP LTE/LTE-A) and common data (e.g., broadcastNRSCH similar to a system information block (SIB) in 3GPP LTE/LTE-A).Although the present disclosure is described mainly based on an exampleof the unicast NRSCH, the scope of the present disclosure is not limitedthereto and the examples may be applied to transmission and reception ofthe broadcast NRSCH. The broadcast NRSCH may be transmitted based on thesame time reference that all of the terminals may be aware of Thus, thebroadcast NRSCH may be transmitted based on not all of time intervalscorresponding to different numerologies (e.g., sTTIs) assumed by therespective terminals, but a single time interval (e.g., subframe) thatputs together all of the time intervals.

Also, the NRCCH and the NRSCH may be assigned within the same TTI.Similar thereto, an sNRCCH and an sNRSCH may be assigned within the samesTTI. Alternatively, the sNRCCH and the sNRSCH may be assigned todifferent TTI indices, such that transmission and reception may beperformed based on a data transmission timing associated with theaforementioned control information. Such operations may be configured orindicated by the base station and then performed. Here, a TTI (i.e.,unscaled TTI) corresponds to a TTI that is configured based on afundamental subcarrier spacing and a number of fundamental OFDM symbols.Also, an sTTI (i.e., scaled TTI) corresponds to a TTI that is configuredbased on an unscaled TTI and based on a scaled subcarrier spacing and/ora scaled number of OFDM symbols. As described above, a variety ofmethods may be employed to configure different TTI lengths. Accordingly,the scaled TTI may be configured using one of the methods.

The examples of the present disclosure relate to, assuming a terminalhaving capability of performing multi-TTI data transmission andreception in the same frequency domain (e.g., the same carrier or thesame component carrier), a method of transmitting control informationand assigning data resources associated with the control information tothe terminal.

Also, the base station may set to terminals such that multi-TTIs basedon different numerologies may be associated with different bandwidthparts (hereinafter, BPs) within a single component carrier. That is, oneor more BPs may be set to a terminal within a single component carrier.The terminal may perform a BP configuration on a bandwidth of a BP lessthan or equal to a maximum bandwidth capability supported by theterminal. A single BP includes continuous PRBs. Also, the bandwidth ofthe BP is greater than or equal to a bandwidth for synchronizationsignal (SS) block transmission that includes a broadcast channel(NR-PBCH, PBCH) and a primary synchronization signal (PSS)/secondarysynchronization signal (SSS) that is an NR synchronization signal. An SSblock may be present or absent in a single BP depending on settings ofthe base station. A single BP may be set to include:

-   -   numerology (i.e., subcarrier spacing, CP length, number of OFDM        symbols per slot);    -   frequency location (i.e., center frequency of BP); and    -   BW (number of PRBs).

The base station may set an available BP to the terminal through RRCsignaling for RRC connected mode UE. By setting a numerology for asingle BP as above, each BP is set based on a unique numerology.Accordingly, the multi-TTIs defined based on the plurality ofnumerologies may be set to the terminal by the base station by settingan independent numerology for each BP. The terminal expects that atleast one DL BP and UL BP among the plurality of set BPs may beactivated (scheduled/received) in a specific time. In the activatedDL/UL BP, the terminal excepts transmission and reception of PDCCH/PDSCHand/or PUSCH/PUCCH.

The following multi-TTI scheduling method is proposed as a schedulingmethod for a terminal based on the aforementioned differentnumerologies. The scheduling method may be applied to, for example, theterminal to which the plurality of BPs is set.

Initially, an example of a control channel design for an NR systemaccording to the present disclosure is described. In detail, a method ofassigning resources of a control channel for NR DL is described.

Herein, a method of assigning a control channel and scheduling data withrespect to a terminal supporting scheduling in a multi-TTI is defined.Hereinafter, a scheduling method in which a base station providescontrol information to a terminal and assigns resources for datatransmission when a plurality of TTIs have different TTI lengths(hereinafter, mixed multi-TTI), not when the plurality of TTIs have thesame TTI length and the same number of OFDM symbols, will be described.A method for the plurality of TTIs to have different TTI lengths mayconfigure and define a single TTI length by combining a subcarrierspacings, the number of OFDM symbols, and a CP length to be same ordifferent.

Embodiment 1

Embodiment 1 relates to a multi-TTI data scheduling method for aterminal having capability of setting a mixed multi-TTI or performingtransmission and reception in the mixed multi-TTI.

In the case of configuring a plurality of TTI lengths based on aplurality of numerologies, an NR terminal refers to a terminal havingcapability of supporting data transmission and reception during the sametime in a physical resource area in a structure in which one or more TTIlengths differ from each other based on the plurality of numerologies.That is, the NR terminal has capability of supporting a mixed multi-TTItransmission scheme in a specific time interval and the NR terminalreports to an NR base station about the terminal capability ofsupporting a mixed multi-TTI operation. The NR base station may providedata scheduling and related configurations to the corresponding NRterminal based on the capability of the NR terminal.

Also, the NR base station may set a numerology to the NR terminal asfollows.

A single NR subframe may include a single TTI or a plurality of TTIs.FIGS. 3 to 10 illustrate examples in which a single NR subframe includes2 sTTIs, sTTI #0 and sTTI #1. Here, it is assumed that sTTI #0 refers toa longer TTI and sTTI #1 refers to a shorter TTI. Also, sTTI #0 may bereferred to as a first type sTTI and sTTI #1 may be referred to as asecond type sTTI.

sTTI #0 may have a time length of 0.5 ms and may include 8 OFDM symbolsbased on a 17.5 kHz subcarrier spacing. That is, sTTI #0 may beexpressed to have a length of 62.54 μs per symbol in the 17.5 kHzsubcarrier spacing. For example, it is assumed that a control area forsTTI #0 is indicated or set using a single OFDM symbol. That is, it isassumed that an NRCCH is transmitted with an NRRS for demodulation ofthe NRCCH within a single OFDM symbol. Basically, the NRCCH may bepresent in a common area (or a cell-specific area) set for the basestation to provide common control information (e.g., SIB) to a pluralityof terminals. Alternatively, the NRCCH may be present in a UE-specificarea set for UE-specific data transmission. In this case, controlinformation for NRSCH demodulation may be carried. Unless the NRCCH istransmitted in the UE-specific area, the base station may transmit theNRSCH in the corresponding area. For example, when resource assignmentfor data transmission is set or indicated in another TTI depending on amixed-TTI scheduling method or a cross-TTI scheduling method describedherein, the NRCCH transmission may not be included in a specific TTI.

sTTI #1 may have a time length of 62.54 μs and may include 2 OFDMsymbols based on a 35 kHz subcarrier spacing. That is, sTTI #1 may beexpressed to have a length of 31.27 μs per slot in the 35 kHz subcarrierspacing. For example, similar to sTTI #0, sTTI #1 corresponds to aresource area that includes transmission of at least one of the NRCCH,the NRSCH, and the NRRS. Accordingly, the same description related tosTTI #0 may be applied to sTTI #1 aside from the TTI time length and/orthe number of OFDM symbols constituting a single TTI.

Although the following examples are described with assuming a numerologyfor sTTI #0 and sTTI #1 as above, it is provided for clarity ofdescription. Accordingly, the scope of the present disclosure is notrestricted by such a specific numerology and the examples disclosedherein may be applied to any numerology in which a scalabilityrelationship is established between different sTTIs.

The following Table 2 and Table 3 show a portion of examples of variousNR numerologies. Although the examples of the present disclosure arebased on numerology #0, numerology #1, and numerology #2, other variousnumerologies not disclosed in Table 2 and Table 3 may be applied.

TABLE 2 Numerology Numerology Numerology Numerology NumerologyNumerology #0 #1 #2 #3 #4 #5 Sub carrier 17.5 kHz 17.5 kHz 35 kHz 15 kHz75 kHz 375 kHz spacing OFDM symbol 62.54 62.54 31.27 66.67 13.33 2.67duration, no CP (μs) CP duration 5.4 5.4 2.7 4.7 0.95 0.19 (μs) CPoverhead 8.6 8.6 8.6 7 7 7 (%) Symbols 16 8 2 14 14 35 per TTI TTIduration 1 ms 0.5 ms 67.94 μs 1 ms 0.2 ms 0.1 ms

TABLE 3 Numerology Numerology Numerology Numerology Numerology #0 #1 #2#3 #4 Subcarrier 15 kHz 30 kHz 60 kHz 120 kHz 240 kHz spacing Symbolsper 7 or 14 7 or 14 7 or 14 14 14 TTI (slot) TTI (slot) 1 ms (14 0.5 ms(14 0.25 ms (14 0.125 ms (14 0.0625 ms (14 duration symbols) symbols)symbols) symbols) symbols) 0.5 ms (7 0.25 ms (7 0.125 ms (7 0.0625 ms (70.03125 ms (7 symbols) symbols) symbols) symbols) symbols)

Through each sTTI assumed as above, the NRCCH may be transmitted withthe NRRS per sTTI and the NRCCH may indicate NRSCH resource assignmentand control information. For example, the NRCCH transmitted in sTTI #0may include information indicating a transmission resource of the NRSCHtransmitted in the same sTTI #0. Likewise, the NRCCH transmitted in sTTI#1 may include information indicating a transmission resource of theNRSCH transmitted in the same sTTI #1. If a mixed multi-TTI operation isset to the terminal by the NR base station, data may be transmitted tothe terminal through a physical resource having a plurality of TTIlengths.

For example, a first symbol of first sTTI #0 may be used fortransmission of the NRCCH (or sNRCCH), and an NRSCH (or sNRSCH)transmission resource of sTTI #0 and/or sTTI #1 may be indicated usingthe NRCCH. The scheduling method described above is referred to as amixed-TTI scheduling method.

The mixed-TTI scheduling method may indicate NRSCH transmission within alonger TTI as well as NRSCH transmission within a shorter TTI using anNRCCH (e.g., DCI #0) transmitted in the shorter TTI. Likewise, themixed-TTI scheduling method may indicate NRSCH transmission within theshorter TTI as well as NRSCH transmission within the longer TTI using anNRCCH (e.g., DCI #1) transmitted in the longer TTI. Additionally, NRSCHtransmission in the shorter TTI and/or longer TTI may be indicatedthrough a combination of the NRCCH (e.g., DCI #0) transmitted in theshorter TTI and the NRCCH (e.g., DCI #1) transmitted in the longer TTI.

In more detail, when the longer TTI is a DCI monitoring TTI, schedulingdata of the longer TTI based on DCI of the longer TTI may correspond toself-TTI scheduling and data may be assigned to a physical resourcecorresponding to the same TTI length as that of a TTI in which the DCIis received. When the longer TTI is the DCI monitoring TTI, schedulingdata of the shorter TTI based on DCI of the longer TTI may correspond tomixed-TTI scheduling and data may be assigned to a physical resourcecorresponding to a TTI length different from that of the TTI in whichthe DCI is received. When the longer TTI is the DCI monitoring TTI,scheduling data of the shorter TTI and the longer TTI based on DCI ofthe longer TTI may correspond to mixed-TTI scheduling and data may beassigned to the physical resource corresponding to the same TTI lengthas that of the TTI in which the DCI is received and the physicalresource corresponding to the TTI length different from that of the TTIin which the DCI is received.

Also, when the shorter TTI is a DCI monitoring TTI, scheduling data ofthe shorter TTI based on DCI of the shorter TTI may correspond toself-TTI scheduling and data may be assigned to a physical resourcecorresponding to the same TTI length as that of a TTI in which the DCIis received. When the shorter TTI is the DCI monitoring TTI, schedulingdata of the longer TTI based on DCI of the shorter TTI may correspond tomixed-TTI scheduling and data may be assigned to a physical resourcecorresponding to a TTI length different from that of a TTI in which theDCI is received. When the shorter TTI is the DCI monitoring TTI,scheduling data of the shorter TTI and the longer TTI based on DCI ofthe shorter TTI may correspond to mixed-TTI scheduling and data may beassigned to the physical resource corresponding to the same TTI lengthas that of the TTI in which the DCI is received and the physicalresource corresponding to the TTI length different from that of the TTIin which the DCI is received.

Also, when all of the longer TTI and the shorter TTI are DCI monitoringTTIs, scheduling data of the longer TTI through a combination of DCI ofthe longer TTI and DCI of the shorter TTI may correspond to self andcross-TTI scheduling. When all of the longer TTI and the shorter TTI areDCI monitoring TTIs, scheduling data of the shorter TTI through acombination of DCI of the longer TTI and DCI of the shorter TTI maycorrespond to self and cross-TTI scheduling. When all of the longer TTIand the shorter TTI are DCI monitoring TTIs, scheduling data of thelonger TTI and data of the shorter TTI through a combination of DCI ofthe longer TTI and DCI of the shorter TTI may correspond to self andcross-TTI scheduling.

As described above, self-TTI scheduling, mixed-TTI scheduling, orcross-TTI scheduling may be performed on resources having different TTIlengths based on different numerologies. Although the following examplesof the present disclosure are described based on a case in which controlinformation (or NRCCH or DCI) is present generally on a resource of thelonger TTI and data (or NRSCH) transmission is assigned in the longerTTI and/or the shorter TTI based on the control information, the scopeof the present disclosure is not limited thereto. The examples may beapplied to a case in which control information (or NRCCH or DCI) ispresent on a resource of the shorter TTI and data (or NRSCH)transmission is assigned in the longer TTI and/or shorter TTI based onthe shorter TTI.

In examples of FIGS. 3 to 10, it is assumed that a single DL NR subframecorresponds to a 17.5 kHz subcarrier spacing (SS), 16 symbols, and atime length of 1 ms. Also, it is assumed that sTTI #0 corresponds to the17.5 kHz SS, 8 symbols, and the time length of 0.5 ms, and sTTI #1corresponds to a 35 kHz SS, 2 symbols, and a time length of 67.94 μs.Also, it is assumed that sTTI #0 and sTTI #1 correspond to differentfrequency domain areas within an allocated frequency bandwidth(allocated BW) (e.g., a single carrier or a single component carrier).Examples of FIGS. 9 and 10 include a case in which sTTI #0 and sTTI #1are present in different frequency domain areas and different timedomain areas, and also include a case in which sTTI #0 and sTTI #1 arepresent in the same frequency domain area and different time domainareas.

The TTI, described herein, which is a time unit for transmitting a datasignal and/or a control signal may refer to a time interval that isdetermined based on a numerology, as described above. The correspondingTTI may be replaced with a time unit, such as a number of OFDM symbolsand a number of slots, and thereby defined. For example, the longer TTImay be represented using 8 OFDM symbols and the shorter TTI may berepresented using 2 OFDM symbols. Also, depending on a numerology, theTTI may have the same time length as a slot and one or more slots may beused to constitute a single TTI.

FIGS. 3 and 4 illustrate examples of mixed-TTI scheduling using a longerDCI format for a single NR terminal according to the present disclosure.

Referring to the example of FIG. 3, DCI of sNRCCH of first (left) sTTI#0 may provide resource assignment information for transmission oftransmission block (TB) #0 of sNRSCH in the first sTTI #0 and secondsTTI #1 to eighth sTTI #1. Also, DCI of sNRCCH of second (right) sTTI #0may provide resource assignment information for TB #1 transmission ofsNRSCH in second sTTI #0 and ninth sTTI #1 to sixteenth sTTI #1.

In the example of FIG. 3, there is a difference between a schedulingmethod for the first sTTI #0 (i.e., sTTI #0 on the left of the figure)and a scheduling method for the second sTTI #0 (i.e., sTTI #0 on theright of the figure). In detail, the difference lies in presence orabsence of data that is assigned in a time interval of sTTI #1corresponding to an OFDM symbol duration that is a control area of sTTI#0 (i.e., a resource corresponding to the same time interval as that ofsNRCCH of sTTI #0, however, corresponding to a different frequencyband), when a data transmission resource in sTTI #1 is assigned using amixed-TTI scheduling method based on transmitted control information insTTI #0.

Whether a start position of a data assignment resource is a symbolimmediately after an end position of a control area or whether the startposition of the data assignment resource includes a symbol of a TTIboundary regardless of the end position of the control area may bedetermined based on processing capability of a corresponding terminal, aterminal category, and a data buffering performance. When the startposition of the data assignment resources is irrelevant to the endposition of the control area, the base station may indicate to theterminal information about start of a corresponding data assignmentresource through control information (i.e., DCI in PDCCH). Also, asingle terminal may be set by applying one of two schemes with respectto the above data transmission start position. The data transmission maystart at a position after transmission of control information ends sothat the terminal may perform operations required to receive data.

Referring to the example of FIG. 4, DCI of sNRCCH of first sTTI #0 mayprovide resource assignment information for TB #0 transmission of sNRSCHin second sTTI #1 to eighth sTTI #1. Also, DCI of sNRCCH of second sTTI#0 may provide resource assignment information for TB #1 transmission ofsNRSCH in tenth sTTI #1 to sixteenth sTTI #1.

To support a data transmission resource assignment in the multi-TTI asshown in the examples of FIGS. 3 and 4, a new DCI format may be defined.In the case of indicating data scheduling within a shorter TTI based ona longer TTI time, data transmission resource assignment information fora longer TTI may be applied to a shorter TTI resource area. For example,the base station may semi-statically preset to the terminal regardingwhether to perform data transmission and reception in physical resources(e.g., bandwidth parts) corresponding to N different TTI durationsthrough upper layer (e.g., radio resource control (RRC)) signaling. Asize of the entire DCI format (i.e., a number of bits) may be determinedbased on the presetting. A physical resource corresponding to a TTIduration in which data assignment is to be potentially performed may beset based on the presetting and the base station may schedule a specifictime/frequency resource among such indicated physical resources to theterminal for the final data assignment. Hereinafter, all the schedulingmethods proposed herein are performed based on the aforementionedprocedure. The following Table 4 represents a new DCI format accordingto the present disclosure. For example, it is assumed that a timeinterval, that is, a duration corresponding to 2 (N=2) TTI lengths(e.g., longer TTI and shorter TTI) is set to the terminal.

TABLE 4 TIF RA MCS NDI RV HARQ process ID TPC Etc

Referring to Table 4, the field “TIF” represents a TTI indicator fieldand may be included in DCI only with respect to a terminal to which amulti-TTI operation is set. If a mixed multi-TTI operation is set (i.e.,if each physical resource area (e.g., BP) corresponding to the multi-TTIis set), the base station may indicate to the terminal a physicalresource area corresponding to a TTI in which data transmission is to bescheduled using the field “TIF”.

For example, a value of the field “TIF” may be preset by the NR basestation to correspond to a single TTI length. For example, if TIF isdefined as a 1-bit size and if TIF value=0, it may indicate setting ofTTI index #0 (e.g., sTTI #0 or BP #0). If TIF value=1, it may indicatesetting of TTI index #1 (e.g., sTTI #1 or BP #1).

If TIF is defined as a 2-bit size and if TIF value=00, it may indicatesetting of TTI index #0 (e.g., sTTI #0 or BP #0). If TIF value=01, itmay indicate setting of TTI index #1 (e.g., sTTI #1 or BP #1), if TIFvalue=10, it may indicate setting of all of TTI index #0 and TTI index#1 (e.g., sTTI #0 (BP #0) and sTTI #1 (BP #1)). If TIF value=11, it mayindicate absence of data scheduling or another purpose, such as, forexample, release of semi-persistent scheduling (SPS), and DL datanon-assignment Transmit Power Control (TPC). Alternatively, if TIFvalue=11, scheduling may be reserved.

Referring again to Table 4, Resource Assignment (RA) may indicate afrequency resource assigned for data transmission. The field “RA”indicates a physical resource area for data reception within a physicalresource area (e.g., BP) that is indicated using the TIF value among theset TTIs. Also, fields “MCS” representing modulation and coding scheme,NDI representing a new data indicator, and RV representing a redundancyversion may be provided per TB/code block (CB)/code block group (CBG).Additionally, control information of HARQ process ID and TPC may beincluded. Further, as control information indicated with Etc, controlinformation, for example, A/N resource offset, UL sounding RS request,and CSI request, may be further included. The aforementioned controlinformation, such as, for example, RA, MCS, NDI, RV, HARQ process ID,TPC, and Etc, may be provided independently (i.e., independent DCIfields are applied for data scheduling within physical resource areascorresponding to different TTIs) per TTI configuration depending on aresource assignment method, and may be provided commonly (i.e., a commonDCI field is applied for data scheduling within physical resource areascorresponding to different TTIs) for data scheduling within physicalresource areas for a plurality of TTI configurations.

According to an additional embodiment, the base station may set theterminal to monitor a control area of a physical resource area (e.g., aphysical area in which a PDCCH including DCI may be transmitted)corresponding to a specific TTI. Therefore, the control area of thephysical resource area corresponding to the specific TTI for PDCCHmonitoring may be set to the terminal by the base station through upperlayer signaling (e.g., RRC signaling). Also, data transmission may bescheduled not in the physical resource area corresponding to thespecific TTI for PDCCH monitoring but in a physical resource areacorresponding to another TTI. This operation may be considered as one ofmethods for cross TTI-scheduling.

FIG. 5 illustrates another example of mixed-TTI scheduling using alonger DC format for a single NR terminal according to the presentdisclosure.

Referring to the example of FIG. 5, DCI of sNRCCH of first (left) sTTI#0 may provide resource assignment information for TB #0 transmission ofsNRSCH in the first (left) sTTI #0 and resource assignment informationfor TB #1 transmission of sNRSCH in second sTTI #1 to eighth sTTI #1.Also, DCI of sNRCCH of second (right) sTTI #0 may provide resourceassignment information for TB #2 transmission of sNRSCH in the secondsTTI #0 and resource assignment of TB #3 transmission of sNRSCH in tenthsTTI #1 to eighteenth sTTI #1.

To support a data transmission resource assignment in a multi-TTI asshown in the example of FIG. 5, a new DCI format may be defined as shownin the following Table 5.

TABLE 5 TIF TTI index#0 RA MCS NDI RV HARQ process ID . . . . . . TTIindex#N-1 RA MCS NDI RV HARQ process ID TPC Etc

The field “TIF” of Table 5 is identical to that of Table 4 and a furtherdescription related thereto is omitted.

In the example of Table 5, RA, MCS, NDI, RV, and HARQ process IDinformation may be provided with respect to each of N TTI indices. Asdescribed above, control information of TPC and Etc (e.g., A/N resourceoffset, UL sounding RS request, CSI request) may be commonly appliedwith respect to the plurality of TTIs.

As a modified example of the example of Table 5, MCS may be provided ascommon information for the plurality of TTIs, instead of being providedfor each TTI index. That is, the same MCS may be applied with respect todata that is transmitted in the plurality of TTIs.

Also, to reduce an increase in overhead by control information fieldsdefined for each of the TTI indices, joint encoding may be applied ormay be defined as a combinational field. For example, joint encoding fora plurality of pieces of control information (e.g., RV, NDI, HARQprocess ID) may be defined as shown in the following Table 6. Thisscheme may lower the flexibility of setting a control information value,however, may reduce a size of control information.

TABLE 6 Joint field TTI index#0 TTI index#1 00 RV = 0, NDI = 0, HARQprocess#0 RV = 1, NDI = 0, HARQ process#0 01 RV = 2, NDI = 0, HARQprocess#1 RV = 1, NDI = 0, HARQ process#3 10 RV = 3, NDI = 0, HARQprocess#5 RV = 2, NDI = 0, HARQ process#2 11 RV = 1, NDI = 1, HARQprocess#6 RV = 1, NDI = 0, HARQ process#7

FIG. 6 illustrates another example of mixed-TTI scheduling using alonger DC format for a single NR terminal according to the presentdisclosure.

Referring to the example of FIG. 6, DCI of sNRCCH of first (left) sTTI#0 may provide resource assignment information for TB #0 transmission ofsNRSCH in the first sTTI #0 and fourth sTTI #1 to eighth sTTI #1. Also,DCI of sNRCCH of second sTTI #0 may provide resource assignmentinformation for TB #1 transmission of sNRSCH in fourteenth sTTI #1.Also, sNRCCH of tenth sTTI #1 may provide resource assignmentinformation for sNRSCH transmission in the corresponding tenth sTTI #1.Alternatively, a resource assignment start position for data assignmentmay be indicated based on OFDM symbol index values and/or slot indexvalues instead of using a TTI unit. Therefore, in the example of FIG. 6,indication of a data resource area corresponding to sTTI #1 maycorrespond to indication of a start position, such as OFDM symbolindices #6 to #15 (TB #0) and OFDM symbol indices #10 and #11 (TB #1).An end position of the data resource area may be a boundary between TTIsor may be indicated in the same manner as the start position throughDCI.

To support a data transmission resource assignment in the multi-TTI asshown in the example of FIG. 6, a new DCI format may be defined asrepresented by the following Table 7.

TABLE 7 TIF RA TTI Assignment (in Time domain) - scheduled TTI index orscheduled first TTI timing value (start/end position in time domain) orusing OFDM/slot index for indicating start/end position in time domainMCS NDI RV HARQ process ID TPC Etc

In the example of Table 7, TIF, RA, MCS, NDI, RV, HARQ process ID, TPC,Etc (e.g., RV, NDI, and HARQ process ID information) is identical tothose of Table 4 or Table 5 and a further description related thereto isomitted.

The example of Table 7 includes the field “TTI assignment”. Dissimilarto the example of Table 4 or Table 5, the example of Table 7 furtherincludes the field “TTI assignment”. Therefore, data transmission may bescheduled based on a TTI index (or TTI number) in a different TTI lengththat is a target in order to schedule data in a resource area having thedifferent TTI length. For example, a resource assignment resolution in atime domain for data transmission in a shorter TTI may be performedbased on the shorter TTI, and the base station may indicate a longer TTIthrough NRCCH (DCI) transmitted in a control area within the longer TTIand may additionally indicate data transmission within the shorter TTI.If a time interval corresponding to the longer TTI is capable of beingequally divided based on a time interval that constitutes the shorterTTI, shorter TTI indices may be assigned in temporal order asillustrated in FIG. 6, within a time interval corresponding to thelonger TTI. For example, shorter TTI indices, 0, 1, . . . , 7, may beassigned within a time interval corresponding to a single longer TTI.Alternatively, as described above, to indicate a start position and anend position for data assignment within all of the longer TTI/shorterTTI, the base station may carry OFDM/slot symbol indices in DCI and maytransmit the same to the terminal. Therefore, regardless of a physicalarea corresponding to the longer TTI/shorter TTI, the start position andthe end position for data assignment may be indicated to the terminal bycombining the start position and the end position for data assignmentinto a TTI unit, an OFDM symbol, and a slot unit through the DCI.Accordingly, resources may be further flexibly and efficiently used,which may lead to enhancing the frequency efficiency of the entire NRsystem.

As described above, when a single longer TTI corresponds to a pluralityof shorter TTIs, indices may be assigned to the plurality of shorterTTIs within a single longer TTI.

Alternatively, if a time interval corresponding to an NR subframe iscapable of being equally divided into time interval units thatconstitute the longer TTI, longer TTI indices may be assigned to thetime units that are divided within the NR subframe. Likewise, if thetime interval corresponding to the NR subframe is capable of beingequally divided into time units that constitute the shorter TTI, shorterTTI indices may be assigned to the time units that are divided withinthe NR subframe. For example, referring to FIGS. 3 to 10, sTTI #0indices, 0 and 1, corresponding to the longer TTI and sTTI #1 indices,0, 1, . . . , 15, corresponding to the shorter TTI may be assigned to asingle NR subframe based on the NR subframe. Hereinafter, description ismade based on a method of assigning shorter TTI indices to a pluralityof shorter TTIs corresponding to a single longer TTI based on the singlelonger TTI. Alternatively, as described above, a start position and anend position for data assignment may be indicated to the terminalthrough DCI based on a time unit, such as, an OFDM symbol index and aslot index within a resource area (e.g., BP) corresponding to each TTI.For example, referring to FIG. 6, in a resource area (e.g., BP #1)corresponding to sTTI #1, OFDM symbol index #6 (start position) and OFDMsymbol index #15 (end position) may be indicated to the terminal throughDCI. Also, the start position and the end position may be indicated bycombining the OFDM symbol index #6 corresponding to the start positionand a time length of 10 OFDM symbols.

Also, the field “TTI assignment” may be defined as a TTI numberindication field. For example, when data transmission resources withinthe shorter TTI are indicated to the terminal through a control channelwithin the longer TTI, resource assignment in at least a time axis maybe indicated using a TTI number. Referring to the example of FIG. 6,when 8 shorter TTIs correspond to a single longer TTI, numbers 0, 1, . .. , 7 may be assigned to the shorter TTIs in temporal order and the basestation may indicate to the terminal a shorter TTI within which a datatransmission resource is to be assigned using the TTI number. Forexample, referring to the example of FIG. 6, for assigning dataresources on the time axis within sTTI #1 corresponding to the first(left) sTTI #0 and to which numbers, 0 to 7, are assigned, numbers 3, 4,5, 6, and 7 may be indicated to the terminal or a timing valueassociated with an index corresponding to first sTTI #1 in consecutivesTTI #1 time intervals may be indicated. The timing may indicate that adata resource is assigned from an sTTI #1 index after a k^(th) sTTI #1index (e.g., k=3 in the case of corresponding to a time interval of thefirst sTTI #0 in FIG. 6) based on an sTTI #1 index (in FIG. 6, sTTI #1index 0 corresponds to a 1 OFDM symbol that is an NRCCH transmissiontime interval within sTTI #0) corresponding to a time interval of NRCCH(DCI) that is transmitted in the longer TTI. Accordingly, the terminalmay attempt to receive data and decode the received data in fourth sTTI#1 to eighth sTTI #1 within the NR subframe/slot. Also, referring againto the example of FIG. 6, for assigning data resources on the time axiswithin sTTI #1 corresponding to second (right) sTTI #0 and to whichnumbers, 0 to 7, are assigned, the number 5 may be indicated to theterminal. Alternatively, as described above, a data area correspondingto OFDM symbol indices #10 and 11 may be indicated through DCI using atime unit, such as an OFDM symbol index and a slot index. Alternatively,a resource may be assigned to the terminal by indicating k=5 based on atiming value k and a time at which the DCI is received. Accordingly, theterminal may attempt to receive data and decode the received data in thefourteenth sTTI #1 within the NR subframe.

Alternatively, the field “TTI assignment” may be defined as a blank TTInumber indication field. The base station may indicate to the terminalthat data resource assignment is absent in a time axis corresponding toa shorter TTI indicated by a blank TTI number. That is, if the aboveexample relates to indicating a TTI number in which data transmission ispresent, the present example relates to indicating a TTI number in whichdata transmission is absent. Alternatively, if a time unit, such as anOFDM symbol index/slot index, is considered, an indication of a blanktime interval may be indicated to the terminal through DCI using acorresponding time unit. In a different frequency bandwidth (e.g.,longer TTI) of the same time, data resource assignment may be present.For example, in the example of FIG. 6, numbers, 0, 1, and 2, may beindicated to the terminal to indicate that data resource assignment isabsent on a time axis within sTTI #1 to which numbers, 0 to 7,corresponding to the first sTTI #0 are assigned. Accordingly, theterminal may be aware that data transmission is absent in the first sTTI#1 to third sTTI #1 within the NR subframe, and may attempt to receiveand decode data in the fourth sTTI #1 to eighth sTTI #1. Also, in theexample of FIG. 6, numbers, 0, 1, 2, 3, 4, 6, and 7, may be indicated tothe terminal for data resource assignment on the time axis within sTTI#1 to which numbers, 0 to 7, corresponding to the second sTTI #0 areassigned. Accordingly, the terminal may be aware that data transmissionis absent in the ninth sTTI #1 to thirteenth sTTI #1 and the fifteenthsTTI #1 and sixteenth sTTI #1 within the NR subframe and may attempt toreceive and decode data in the fourteenth sTTI #1. As described above,the blank time interval may be indicated based on a time unit such as anOFDM symbol index and a slot index.

The blank TTI may be indicated by the base station to the terminal toperform clear channel assignment (CCA) of the NR system that operates ina non-licensed carrier in addition to performing the resourceassignment. That is, an apparatus that operates in the non-licensedcarrier is required to verify whether another apparatus is using achannel prior to transmitting a signal, which may be referred to as aListen-Before-Talk (LBT) operation. The blank TTI may be recognized asinformation indicating that data transmission is absent during acorresponding time interval. Therefore, the terminal that operates inthe non-licensed carrier may perform CCA based on a time interval inwhich signal transmission from the base station is absent, using theblank TTI. When it is determined that signal transmission from the otherapparatus is absent as a result of performing the CCA, that is, when theLBT succeeds, the terminal may perform uplink transmission in an UL TTI.

DCI including the aforementioned blank time interval (e.g., blank TTI,blank symbol, or blank slot) may be transmitted to a plurality ofterminals through a common group PDCCH. Terminals receivingcorresponding signaling do not assume any other operation in at least acorresponding blank time interval. Accordingly, from perspective of atleast a corresponding terminal, how a corresponding blank time intervalis to be actually used from perspective of a network may be unknown.Alternatively, for interference measurement or operation in thenon-licensed serving cell, information on the blank time interval may besignaled to the corresponding terminal so that an operation of thecorresponding terminal may be performed in the blank time interval.

As described above in the examples, the field “TTA assignment” (dataarea start and end indication field) may be configured using a bitmap,combinational index, and a starting point with length.

In the aforementioned examples, in a TTI (i.e., a TTI in which only datatransmission is present) in which a resource used for control channeltransmission is not required, a physical resource available for thecontrol channel transmission may be used based on base stationscheduling. According to the above method, the terminal performsdemodulation of NRCCH based on a UE-specific RS instead of performingthe demodulation based on a cell-specific (or common) RS. Accordingly,control channel transmission and data channel transmission may befurther flexibly scheduled.

FIG. 7 illustrates an example of 2-stage DCI scheduling using amulti-TTI according to the present disclosure.

Referring to the example of FIG. 7, first type DCI of sNRCCH of first(left) sTTI #0 may indicate that third sTTI #1 to sixth sTTI #1 arecandidate areas in which data transmission is possible. Second type DCItransmitted from the third sTTI #1 to sixth sTTI #1 may provide resourceassignment information for transmission of TB #1, TB #2, TB #3, and TB#4, respectively. Also, first type DCI of sNRCCH of second (right) sTTI#0 may indicate that ninth sTTI #1 to fourteenth sTTI #1 are candidatearea in which data transmission is possible. Second type DCI of theninth sTTI #1 may provide resource assignment information fortransmission of TB #5 in ninth sTTI #1 to eleventh sTTI #1 and secondtype DCI of the twelfth sTTI #1 may provide resource assignmentinformation for transmission of TB #6 in twelfth sTTI #1 to fourteenthsTTI #1.

In the example of FIG. 7, data resources may be assigned by combining aplurality of pieces of DCI transmitted in different TTIs. In the exampleof FIG. 7, it is assumed that there is no need to provide the terminalwith semi-static signaling about a DCI monitoring TTI for cross-TTIscheduling, each data transmission is indicated within eachcorresponding TTI (i.e., self-TTI scheduling), and a different TB istransmitted in each TTI. Here, a 2-stage DCI scheduling method may beapplied to efficiently transmit control information within the shorterTTI. That is, 2-stage DCI scheduling may be used for data resourceassignment within a resource area corresponding to a specific TTI, amongresource areas corresponding to different TTIs. The 2-stage DCIscheduling method may be applied within a resource area corresponding tothe same TTI. Although the following description is made based on the2-stage DCI scheduling method corresponding to different TTIs, it isprovided as an example only and the present disclosure is not limited tosuch a configuration environment.

In more detail, as in the example of FIG. 7, control information, thatis, DCI may be transmitted to indicate data resource assignment witheach TTI within each corresponding TTI. Accordingly, the terminal mayperform a monitoring operation (e.g., blind decoding) to receive thecontrol information in each corresponding TTI. Herein, such operation isdefined as a self-TTI scheduling method.

Also, a portion of control information for assigning a data transmissionresource within a shorter TTI may be derived from DCI that istransmitted in a longer TTI. That is, it may correspond to 2-stage DCIscheduling in that resource assignment information for the datatransmission is configured by combining DCI that is transmitted in thelonger TTI and DCI that is transmitted in the shorter TTI. For example,for 2-stage DCI scheduling, two types of DCI formats may be configuredas expressed by the following Table 8 and Table 9. Also, the proposed2-stage DCI scheduling may be applied in a resource area correspondingto the same TTI.

TABLE 8 RA TTI Assignment (in Time domain) - Scheduled TTI index orScheduled first TTI timing value MCS TPC Etc

TABLE 9 NDI TIF RV HARQ process ID

Also, the DCI format of Table 8 corresponds to a format of the firsttype DCI that is transmitted in the longer TTI, and RA, TTI assignment,MCS, TPC, and Etc (e.g., RV, NDI, HARQ process ID) are identical tothose of Table 4, Table 5, and Table 7, and thus further descriptionrelated thereto is omitted here. Here, the field “RA” may be present perTTI index depending on a resource assignment method. Although FIG. 7illustrates an example of performing resource assignment in a frequencydomain corresponding to sTTI #1 based on a time length of sTTI #1,resource assignment in the frequency domain using the field “RA” ofTable 7 may be applied to resource assignment in a frequency domaincorresponding to sTTI #0 based on a time length of sTTI #1.

The DCI format of Table 9 corresponds to a format of the second type DCIthat is transmitted in the shorter TTI, and NDI, TIF, RB, and HARQprocess ID are identical to those of Table 4, Table 5, and Table 7, andthus further description related thereto is omitted here.

As described above, for scheduling data transmission in the shorter TTI,modification may be performed slowly or control information not requiredto be modified may be transmitted through the first type DCI that istransmitted in the longer TTI. Only information required to transmit adifferent TB in each corresponding shorter TTI may be transmittedthrough the second type DCI that is transmitted in the shorter TTI. Acontrol information field present in different DCI may be applied to bedifferent from that of the example. Accordingly, the control informationfields may be included in different DCI and thereby transmitted.

The aforementioned 2-stage scheduling method may significantly reduceoverhead of control information for indicating data transmission pershorter TTI and may not significantly affect the performance.Accordingly, data transmission scheduling may be further efficientlyperformed in the shorter TTI. Also, due to a reduction in a size of DCIthat is transmitted in the shorter TTI, link transmission performancemay be further enhanced based on the same transmission power. The methodof indicating data transmission may be applied to a scenario in whichdelay of data transmission through the shorter TTI is required, however,an actual physical channel environment does not greatly change.

Also, since indices for different TTIs in the same frequency domain aredefined within DCI, cross-TTI scheduling corresponding to the same TTInumerology (e.g., shorter TTI), however, corresponding to the same TTIor different TTIs may be applied as shown in the example of FIG. 7. Forexample, a new DCI format may be defined as expressed by the followingTable 10.

TABLE 10 RA Time index#0 MCS NDI RV HARQ process ID . . . . . . Timeindex#N-1 MCS NDI RV HARQ process ID TPC Etc

In the example of Table 10, RA, MCS, TPC, and Etc (e.g., RV, NDI, HARQprocess ID) may be commonly applied to a plurality of time indices andMCS, NDI, RV, and HARQ process ID may be individually provided to eachof the time indices. Accordingly, data transmission may be efficientlyscheduled on physical resources all having the same TTI length, however,corresponding to different points in times. Information on a time domainabout data assignment corresponding to a plurality of slot indices orOFDM symbol indices for transmission of TB #5 and TB #6 in FIG. 7 may beprovided using DCI indication information on the start position and theend position for data assignment proposed in FIG. 6. In addition, finaldata assignment may be provided to the terminal by additionallyperforming the 2-stage scheduling proposed in FIG. 7.

Although cross-TTI scheduling is indicated through the 2-stagescheduling proposed in FIG. 7, the cross-TTI scheduling may also beperformed through signaling of the start position and the end positionof the data area proposed in FIG. 6 using a single piece of DCI.

FIG. 8 illustrates an example of overriding resource assignment oflonger DCI based on shorter DCI according to the present disclosure.

Referring to the example of FIG. 8, DCI (i.e., longer DCI) of sNRCCH offirst (left) sTTI #0 may provide resource assignment information for TB#0 transmission of sNRSCH in the first sTTI #0 and second sTTI #1 toeighth sTTI #1. Additionally, DCI (i.e., shorter DCI) of sNRCCH of fifthsTTI #1 may provide resource assignment information for TB #2transmission of sNRSCH in the fifth sTTI #1 and sixth sTTI #1. That is,although the longer DCI indicates that the fifth sTTI #1 and sixth sTTI#1 are assigned for TB #0 transmission, such scheduling may beoverridden or replaced by the shorter DCI. Therefore, TB #0 transmissionmay be rate-matched excluding resource elements for TB #2 transmissionor may be punctured in the resource elements for TB #2 transmission.Accordingly, new TB #2 transmission may be performed in a portion of adata area in which TB #0 is transmitted, based on the two pieces of DCI(longer DCI and shorter DCI) and the control information correspondingthereto may be provided in advance to the terminal and information onthe new TB #2 transmission may be provided to the terminal to preventthe performance from being degraded in receiving at least TB #0.

Also, in the example of FIG. 8, DCI (i.e., longer DCI) of sNRCCH ofsecond (right) sTTI #0 may provide resource assignment information forTB #1 transmission of sNRSCH in the second sTTI #0 and ninth sTTI #1 tosixteenth sTTI #1. Additionally, DCI (i.e., shorter DCI) of sNRCCH ofthe thirteenth sTTI #1 may provide information regarding that thethirteenth sTTI #1 and a partial time interval of sTTI #0 correspondingto a second symbol section of the thirteenth sTTI #1 are assigned for TB#3 transmission. That is, although the longer DCI indicates that thethirteenth sTTI #1 and the partial time interval of sTTI #0corresponding to the second symbol section of the thirteenth sTTI #1 areassigned for TB #1 transmission, such scheduling may be overridden orreplaced by the shorter DCI. Accordingly, TB #1 transmission may berate-matched excluding resource elements for TB #3 transmission or maybe punctured in the resource elements for TB #3 transmission.

The proposed scheduling method may be applied between differentterminals. For example, UE1 may be provided with information on aresource area for a data area in which data is assigned to TB #0 throughlonger DCI and corresponding to TB #2 for UE2 through additional DCIsignaling. Through this, it is possible to prevent data demodulationperformance for TB #0 from being degraded. Here, information on thepresence of the data area corresponding to TB #2 for UE2 may be providedfrom the base station to UE1 through DCI signaling using the blank areaindication method considered in FIG. 6. Here, referring to FIGS. 6 and8, a specific data area may be indicated using an OFDM symbol, a slot,and a TTI in a time domain and using RE and RB units in a frequencydomain. Also, a blank area may be indicated with being limited to aspecific resource area. Here, the blank area may be indicated to begreater than or equal to a resource area for assigning a single codeblock (CB) or a single code block group (CBG). The specific resourcearea may be one of CBs/CBGs constituting TB #0 or may be limited to anarea corresponding to a portion thereof. Accordingly, new datatransmission (e.g., TB #2/3) may be performed by providing a new pieceof DCI on a specific resource area within a relatively large resourcearea that is assigned to transmit a relatively great TB size (e.g., TB#0/1).

Although a suitable service varies depending on a different TTI lengthor a different number of OFDM symbols, the scheduling method may supportfurther flexible and efficient resource utilization and datatransmission by considering a characteristic of traffic occurring foreach service. For example, although data transmission for the eMBBpurpose is indicated by the base station to the terminal, data may needto be quickly and reliably transmitted such as URLLC. In this case,rate-matching or puncturing may be performed in a portion of a resourceassigned for the eMBB intended data transmission and a correspondingresource area may be used for URLLC intended traffic transmission.

When the scheduling method is applied, the terminal may additionallyperform shorter DCI monitoring. Unless additional signaling formonitoring shorter DCI is performed, the terminal may perform blinddecoding to receive shorter DCI within the shorter DCI in addition to anoperation of monitoring longer DCI. When the shorter DCI is detected,the terminal may attempt to receive and decode new data based onresource assignment information that is overridden based on thecorresponding information. In this case, the terminal may be aware thatrate-matching or puncturing is applied to data scheduled by the longerDCI by considering a data transmission assignment area indicated by thedetected shorter DCI in a data transmission assignment area indicated bythe longer DCI. Accordingly, the terminal may attempt to receive anddecode the data scheduled by the longer DCI.

Also, a resource indicated by the shorter DCI for scheduling of new datatransmission may perform data transmission in a frequency resourcecorresponding to the longer TTI and the shorter TTI regardless of a TTI.That is, in the example of FIG. 8, data transmission indicated by theshorter DCI, such as TB #3 transmission, may be scheduled in sTTI #1 anda frequency domain of sTTI #1.

Here, each of DCI transmitted in the shorter TTI and DCI transmitted inthe longer TTI may be independently defined for data scheduling in acorresponding TTI. In this case, each piece of DCI may be independentlytransmitted to the terminal. Alternatively, fields “TIF” and “timeindex” may be added to the shorter DCI and/or longer DCI. Accordingly, aspecific time interval of the longer DCI may be assigned as a resourcefor data transmission by the shorter DCI.

Embodiment 2

Embodiment 2 relates to a multi-TTI data scheduling method for aterminal to which a mixed multi-TTI is not set or having capability forsimultaneously performing transmission and reception in the mixedmulti-TTI on the same time. That is, there may be a terminal incapableof performing data transmission and reception in the same multi-TTI dueto difficulty of implementation or limit of cost. In particular, since astructure and a standard of a physical channel are different for each ofdifferent TTI lengths, the terminal needs to include a multi-processingchannel to support simultaneous data transmission and reception in themulti-TTI.

For example, although data transmission and reception may be performedonly in a physical resource corresponding to a single TTI length (e.g.,either longer TTI or shorter TTI) at a specific position, that is, aspecific point in time, a data scheduling method for a terminal capableof semi-statically or dynamically switching an available TTI length overtime in response to an indication or an configuration of the basestation may be considered. For such operation, the base station mayprovide a new configuration corresponding to a new (or switching) TTIlength through semi-statically signaling, such as upper layer signaling,and also in a further dynamical manner.

FIG. 9 illustrates an example of DCI based TTI switching according tothe present disclosure. To dynamically perform TTI switching for datatransmission in resource areas corresponding to different TTIs, the basestation may preset a resource area corresponding to an available TTI(e.g., BP) to the terminal and may perform TTI switching through DCIsignaling in a set of available resource areas. In this manner, the basestation may perform data scheduling for the terminal.

Referring to the example of FIG. 9, the base station may perform datatransmission in an area corresponding to a different TTI length overtime among areas corresponding to different TTI lengths (e.g., longerTTI such as sTTI #0 and shorter TTI such as sTTI #1). For example, datatransmission corresponding to TB #0 may be performed in a longer TTIarea during a time interval corresponding to first sTTI #0, datatransmission corresponding to TB #1, TB #2, TB #3, TB #4, TB #5, and TB#6 may be performed in a shorter TTI area during a time intervalcorresponding to second sTTI #0, and data transmission corresponding toTB #7 may be performed in a longer TTI area during a time intervalcorresponding to third sTTI #0.

If the base station has not provided in advance the terminal withsignaling or configuration about switching between different TTIlengths, the terminal may be unaware of a TTI in which data is to bescheduled, and thus may operate as follows.

For example, the terminal may attempt to detect sNRCCH (or DCI) byperforming blind decoding in all of control areas of a plurality of TTIlengths (e.g., longer TTI such as sTTI #0 and shorter TTI such as sTTI#1).

Alternatively, similar to the 2-stage DCI signaling method, the terminalmay detect sNRCCH (or first type DCI) through blind decoding in acontrol area within a longer TTI, and may attempt to detect DCI in acontrol area to be monitored in a shorter TTI through a shorter TTInumber, an OFDM/slot index or the aforementioned timing information fromcontrol information that is included in the detected first type DCI.

FIG. 10 illustrates an example of preset/pattern or signaling based TTIswitching according to the present disclosure. Through RRC signalingwithin a set of resource areas (e.g., BPs) corresponding to differentTTI durations considerable in FIG. 9, data transmission and receptionmay be set to be performed in a resource area corresponding to adifferent TTI per specific time interval. Alternatively, signaling forTTI switching may be performed through DCI signaling and/or a patterncorresponding to the specific time interval.

Similar to the example of FIG. 9, in the example of FIG. 10, the basestation may perform data transmission in an area corresponding to adifferent TTI length over time among areas corresponding to differentTTI lengths (e.g., longer TTI such as sTTI #0 and shorter TTI such assTTI #1).

Dissimilar to the example of FIG. 9, in the example of FIG. 10, the basestation may provide in advance the terminal with signaling orpre-configuration for switching between different TTI lengths. That is,once information, such as a TTI switching configuration, is provided inadvance to the terminal, the terminal may determine a corresponding timeinterval and TTI length available for scheduling data transmission. Forexample, the base station may indicate to the terminal a TTI length inwhich control information and/or data transmission is available based ona unit of the longer TTI or NR subframe.

The TTI switching configuration may be provided from the base station tothe terminal through upper layer signaling.

Alternatively, the TTI switching configuration may be provided from thebase station to the terminal through specific DCI/common DCI signaling.The common DCI may be transmitted to provide common control informationgroup-specifically (i.e., to a plurality of terminals belonging to aspecific group) on a physical resource corresponding to a specific TTIlength.

Also, the terminal may expect DCI and data transmission in only a singleTTI during a specific time interval corresponding to the longer TTI.

Although FIGS. 9 and 10 illustrate examples in which different types ofTTIs (e.g., longer TTI such as sTTI #0 and shorter TTI such as sTTI #1)are distinguishably assigned to different frequency domains, a mappingrelationship between the frequency domain and the TTIP type is notlimited thereto. Different types of TTIs may be applied depending on atime interval, in a single identical frequency domain.

Signaling and DCI field information associated with all of thescheduling methods proposed in FIGS. 3 to 10 may be combined with eachother and thereby employed. Corresponding DCI and RRC signalinginformation and a structure thereof may vary depending on a schedulingmethod and signaling information to be provided to terminals.Accordingly, the methods proposed in FIGS. 3 to 10 may be implementedthrough various combinations. For example, based on a base stationconfiguration for resource areas (e.g., BPs) corresponding to differentTTI durations that are basically considered in FIGS. 3 to 10, datascheduling may be indicated to the terminal through DCI only on aresource area (e.g., BP) corresponding to a portion thereof or at leastone different TTI duration. Information on start and end positions forsuch data scheduling may be additionally provided to the terminalthrough DCI. Referring to FIGS. 6 and 8, new DCI signaling may beprovided to the corresponding terminal to assign a data area for new TBtransmission in addition to a resource area in which a specific TB isassigned to a data area. DCI signaling and RRC configuration to supportsuch a function is provided from the base station to the terminal.

FIG. 11 illustrates an example of a method for transmission andreception of a control channel and a data channel based on a pluralityof numerologies in an NR system according to the present disclosure.

Referring to FIG. 11, in operation S1110, an NR UE may report to an NReNB about UE capability. For example, the UE capability may includeinformation regarding whether the NR UE supports a mixed multi-TTI.

In operation S1120, the NR eNB may provide the terminal with aconfiguration for mixed-TTI scheduling or cross-TTI scheduling based onthe UE capability.

In operation 51130, the NR eNB may generate resource assignmentinformation for data (NRSCH) transmission in a new NR DCI formatdepending on the mixed-TTI or cross-TTI scheduling method and maytransmit the generated resource assignment information to the terminalthrough NRCCH.

In operation S1140, the NR UE may acquire NR DCI by performing blinddetection on the NRCCH transmitted from the NR eNB.

In operation S1150, the NR UE may verify the resource assignmentinformation for data transmission based on the NR DCI acquired inoperation S1140 and may attempt to receive and decode data on acorresponding resource.

Alternatively, in operation S1150, the NR UE may verify a resourcecandidate for data transmission based on the NR DCI (e.g., first typeDCI) acquired in operation S1140 and may attempt to detect additional NRDCI (e.g., second type DCI) on the corresponding resource candidate.Accordingly, resource assignment information for data transmission maybe determined based on a combination of the first type DCI and thesecond type DCI (i.e., 2-stage method). Accordingly, the NR UE mayattempt to receive and decode data on the corresponding resource.

In operation 51160, if the data is successfully decoded, the NR UE mayfeed back ACK to the NR eNB. Otherwise, the NR UE may feed back NACK tothe NR eNB.

As described above, according to the present disclosure, resourcessupporting different TTI types within a single frequency domain area(e.g., carrier or component carrier) may be multiplexed using an FDMscheme, a TDM scheme, or an FDM-TDM scheme, and may include resourcessupporting a plurality of different types of TTIs within an NR subframe.Here, resources supporting different TTIs may have a scalablerelationship. In this case, it is possible to increase a utilization ofsystem resources and to efficiently support multi-TTI based datascheduling based on a correlation between the NRCCH (or sNRCCH) and theNRSCH (or sNRSCH) and a DCI format for the same.

Although the aforementioned methods are described in series ofoperations for clarity of description, they are not provided to limitorder in which each operation is performed and operations may beperformed simultaneously or in different order if necessary. Also, aportion of the operations may be omitted to implement the methodaccording to the present disclosure.

The aforementioned embodiments include examples about various aspects.Although all of the possible combinations representing the variousaspects may not be described herein, those skilled in the art may beaware that the various combinations are possible. Accordingly, thepresent disclosure should be understood to include all otherreplacements, modifications, and changes within the scope of the claims.

The scope of the present disclosure includes an apparatus (e.g., awireless device and components thereof that are described with referenceto FIG. 12) configured to process or implement operations according tovarious embodiments

FIG. 12 is a diagram illustrating a configuration of a wireless deviceaccording to the present disclosure.

FIG. 12 illustrates an NR UE apparatus 100 corresponding to an uplinktransmission apparatus or a downlink reception apparatus and an NR eNBapparatus 200 corresponding to a downlink transmission apparatus or anuplink reception apparatus.

The NR UE apparatus 100 may include a processor 110, an antenna device120, a transceiver 130, and a memory 140.

The processor 110 may perform baseband-related signal processing and mayinclude a first module and a second module. The first module maycorrespond to an upper layer processing and may process an operation ofa Medium Access Control (MAC) layer, a Radio Resource Control (RRC)layer, or more upper layers. The second module may correspond to aphysical (PHY) layer processing and may process an operation (e.g., anuplink transmission signal processing and downlink received signalprocessing) of a PHY layer. However, it is provided as an example only,and the first module and the second module may be configured as a singleintegrated module and may also be configured using three or moreseparate modules. In addition to performing baseband related signalprocessing, the processor 110 may control the overall operation of theNR UE apparatus 100.

The antenna device 120 may include at least one physical antenna. If theantenna device 120 includes a plurality of antennas, Multiple InputMultiple Output (MIMO) transmission and reception may be supported. Thetransceiver 130 may include a radio frequency (RF) transmitter and an RFreceiver. The memory 140 may store software, an operating system (OS),an application, etc., associated with an operation of the NR UEapparatus 100, and may include a component such as a buffer.

The NR eNB apparatus 200 may include a processor 210, an antenna device220, a transceiver 230, and a memory 240.

The processor 210 may perform baseband related signal processing and mayinclude a first module and a second module. The first module maycorrespond to an upper layer processing and may process an operation ofa MAC layer, an RRC layer, or more upper layers. The second module maycorrespond to a PHY layer processing and may process an operation (e.g.,an uplink transmission signal processing and downlink received signalprocessing) of a PHY layer. However, it is provided as an example only,and the first module and the second module may be configured as a singleintegrated module and may also be configured using three or moreseparate modules. In addition to performing baseband related signalprocessing, the processor 210 may control the overall operation of theNR eNB apparatus 200.

The antenna device 220 may include at least one physical antenna. If theantenna device 220 includes a plurality of antennas, MIMO transmissionand reception may be supported. The transceiver 230 may include an RFtransmitter and an RF receiver. The memory 240 may store software, anOS, an application, etc., associated with an operation of the NR eNBapparatus 200, and may include a component such as a buffer.

The second module 112 of the NR UE apparatus 100 may receive at leastone of first type DCI and second type DCI in at least one of a firsttype TTI (e.g., longer TTI) and a second type TTI (e.g., shorter TTI).Also, the second module 112 may determine a resource for datatransmission in at least one of the first type TTI and the second typeTTI based on at least one of the first type DCI and the second type DCI.Also, the second module 112 may include an operation of receiving datafrom the NR eNB apparatus 200 on the determined resource. The secondmodule 112 may transmit the received data to the first module 111. Thefirst module 111 may attempt to decode data. If the data is successfullydecoded, the first module 111 may generate ACK and transmit the same tothe NR eNB apparatus 200, and otherwise, may generate NACK and transmitthe same to the NR eNB apparatus 200.

The second module 212 of the NR eNB apparatus 200 may transmit at leastone of the first type DCI and the second type DCI to the terminal in atleast one of the first type TTI (e.g., longer TTI) and the second typeTTI (e.g., Shorter TTI). Here, at least one of the first type DCI andthe second type DCI may include resource assignment information for datathat is transmitted in at least one of the first type TTI and the secondtype TTI. The second module 212 may transmit data to the NR UE apparatus100 on the resource that is determined based on the resource assignmentinformation. Also, the second module 212 may transmit ACK/NACKinformation received from the NR UE apparatus 100 to the first module211. The first module 211 may determine whether to performretransmission to the NR UE 100 based on the ACK/NACK information.

The aforementioned operation of the processor 110 of the NR UE apparatus100 or processor 210 of the NR eNB apparatus 200 may be implementedthrough software processing or hardware processing, or may beimplemented through software and hardware processing.

The scope of the present disclosure includes software (or, an OS, anapplication, firmware, a program, etc.) configured to implementoperations according to various embodiments on an apparatus or acomputer and a medium configured to store and execute such software onthe apparatus or the computer.

What is claimed is:
 1. A method comprising: receiving, by a wirelessdevice from a base station, one or more radio resource control (RRC)signals indicating a number of first bandwidth parts configured for thewireless device; receiving, by the wireless device, downlink controlinformation (DCI) comprising a first indicator field that indicates atleast one of the first bandwidth parts, wherein a bitwidth of the firstindicator field is based on the number of the first bandwidth partsconfigured for the wireless device; determining, based on the bitwidthand based on the DCI, a value of the first indicator field; determining,based on the value of the first indicator field, one or more resourcesof the at least one of the first bandwidth parts; and performing, basedon the one or more resources, a data communication with the basestation.
 2. The method of claim 1, wherein the one or more RRC signalsindicate a number of second bandwidth parts configured for the wirelessdevice.
 3. The method of claim 2, wherein the first bandwidth partscorrespond to a plurality of uplink bandwidth parts, and the secondbandwidth parts correspond to a plurality of downlink bandwidth parts;or wherein the first bandwidth parts correspond to a plurality ofdownlink bandwidth parts, and the second bandwidth parts correspond to aplurality of uplink bandwidth part.
 4. The method of claim 2, furthercomprising: receiving, by the wireless device, second DCI comprising asecond indicator field that indicates at least one of the secondbandwidth parts, wherein a second bitwidth of the second indicator fieldis based on the number of the second bandwidth parts configured for thewireless device; determining, based on the second bitwidth and based onthe second DCI, a value of the second indicator field; determining,based on the value of the second indicator field, one or more secondresources of the at least one of the second bandwidth parts; andperforming, based on the one or more second resources, a second datacommunication with the base station.
 5. The method of claim 1, whereinthe number of first bandwidth parts configured for the wireless deviceis semi-statically configured, and wherein the number of first bandwidthparts configured for the wireless device indicates the bitwidth of thefirst indicator field as one of 0, 1, or
 2. 6. The method of claim 1,wherein the one or more RRC signals indicate the wireless device tomonitor a physical resource region corresponding to a particulartransmission time interval (TTI).
 7. The method of claim 1, wherein theDCI comprises an assignment field indicating start and end points of adata assignment, wherein the assignment field is associated with acombination of slot information and symbol information of the at leastone of the first bandwidth parts, and wherein the data assignment isassociated with a physical uplink shared channel or with a physicaldownlink shared channel.
 8. The method of claim 1, further comprising:receiving, from the base station, different DCI indicating adeactivation of the at least one of the first bandwidth parts andindicating an activation of a different one of the first bandwidthparts.
 9. The method of claim 1, further comprising: receiving, from thebase station, a different RRC signal indicating a deactivation of the atleast one of the first bandwidth parts and indicating an activation of adifferent one of the first bandwidth parts.
 10. The method of claim 1,further comprising: receiving, from the base station, configurationinformation, of the at least one of the first bandwidth parts,comprising subcarrier spacing information, cyclic prefix information,and frequency information.
 11. A method comprising: transmitting, by abase station to a wireless device, one or more radio resource control(RRC) signals indicating a number of first bandwidth parts configuredfor the wireless device; determining, based on the number of the firstbandwidth parts configured for the wireless device, a bitwidth of afirst indicator field of downlink control information (DCI); generating,based on the bitwidth, the DCI comprising a value, of the firstindicator field, that indicates at least one of the first bandwidthparts; transmitting, to the wireless device, the DCI; determining, basedon the value of the first indicator field, one or more resources of theat least one of the first bandwidth parts; and performing, based on theone or more resources, a data communication with the wireless device.12. The method of claim 11, wherein the one or more RRC signals indicatea number of second bandwidth parts configured for the wireless device.13. The method of claim 12, wherein the first bandwidth parts correspondto a plurality of uplink bandwidth parts, and the second bandwidth partscorrespond to a plurality of downlink bandwidth parts; or wherein thefirst bandwidth parts correspond to a plurality of downlink bandwidthparts, and the second bandwidth parts correspond to a plurality ofuplink bandwidth part.
 14. The method of claim 12, further comprising:determining, based on the number of the second bandwidth partsconfigured for the wireless device, a second bitwidth of a secondindicator field of second DCI; generating, based on the second bitwidth,the second DCI comprising a value, of the second indicator field, thatindicates at least one of the second bandwidth parts; transmitting, tothe wireless device, the second DCI; determining, based on the value ofthe second indicator field, one or more second resources of the at leastone of the second bandwidth parts; and performing, based on the one ormore second resources, a second data communication with the wirelessdevice.
 15. The method of claim 11, wherein the number of firstbandwidth parts configured for the wireless device is semi-staticallyconfigured, and wherein the number of first bandwidth parts configuredfor the wireless device indicates the bitwidth of the first indicatorfield as one of 0, 1, or
 2. 16. The method of claim 11, wherein the oneor more RRC signals indicate the wireless device to monitor a physicalresource region corresponding to a particular transmission time interval(TTI).
 17. The method of claim 11, wherein the DCI comprises anassignment field indicating start and end points of a data assignment,wherein the assignment field is associated with a combination of slotinformation and symbol information of the at least one of the firstbandwidth parts, and wherein the data assignment is associated with aphysical uplink shared channel or with a physical downlink sharedchannel.
 18. The method of claim 11, further comprising: transmitting,to the wireless device, different DCI indicating a deactivation of theat least one of the first bandwidth parts and indicating an activationof a different one of the first bandwidth parts.
 19. The method of claim11, further comprising: transmitting, to the wireless device, adifferent RRC signal indicating a deactivation of the at least one ofthe first bandwidth parts and indicating an activation of a differentone of the first bandwidth parts.
 20. The method of claim 11, furthercomprising: transmitting, to the wireless device, configurationinformation, of the at least one of the first bandwidth parts,comprising subcarrier spacing information, cyclic prefix information,and frequency information.